Abstract
An elongated toroidal cage form of graphitic carbon C 240 that has an elliptical cross section is proposed. The elongated toroidal form consists of pairs of pentagons and heptagons among the hexagons of carbon atoms. The rotational symmetry, the cohesive energies, and thermal stabilities of the elongated toroidal forms derived from C 240 , as well as other various toroidal forms are studied by molecular dynamics. It is found that the sevenfold rotational symmetry is the most stable for the elongated toroidal forms derived from C 240 , although both fivefold and sixfold rotational symmetries are the most stable for the toroidal forms derived from the tori C 360 previously proposed by us and from C 240 proposed by Dunlap
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